Plate positioning device



Nov. 28, 1933. H. A. w. woon PLATE PosITIoNING DEVICE Filed Jan. 22, 1931 2 Sheets-Sheet l i QN Filed Jan. 22, 1931 2 Sheets-Sheet 2 scale; Y

Patented Nov. 2s, 1933 This inventibnrelates' to the proper positioning of printing 'plates 'onftheylindersof a printing press; particularlya newspaper printing press.

, Theprincipal objects of the invention are to provide' means Awhereby if"the`plate tends to lengthen circumferentiallyor laterally the means by whichits edgesareheldwillnot pre'eve'nt4 the lengthening or widening .of the plate butV will prevent its buckling and'will 'keep the plate flat 10 on the cylinderv in spite of any such growth;` L

' .Y Other objects and vadvantages ofthe invention will appear hereinafter.

` Reference is to be had to thelaccompanying drawings. in which 4 Fig. 1 is afplan', of a n provided with preferredembodimentsof this invention in severaly places; 4. 1 v i' Fig. 2 isl anend View as indicatedjby thearrow 2 in Fig-1,' partly insection, 'anden enlarged Fig`.1`; vz L ,v l ,Figmi isA a side. view looking `inthe direction of thev arrow 4in Fig. 3,; l Figs. 5` and Gare vie `s similar 4to Fig. 3 showingmodiflcations; Q j Fig. T isfa side View of a portionof the cylinder showing the application of thisinvention to the `end clamp; asindicated by'vthe'larrow 7., in FglZ; i r

der showing the application of the'invention to a center clip;

Fig. 9 is a sectional view on the Fig.8;

Fig. 10 is a view like Fig. 8 showing another modiication; Fig. 11 is a sectionalview on the line 117-11 of Fig. 10, and v Y v Fig. 12 is a sectional view showing a sharp edged pin which may be inserted intoany of the clips now in use.

A curved stereotype printing plate cannot, very well be totally vrestricted on all four sides when clamped to a cylinder because the action of printof the plate after repeated impressions. This invention is designed largely for allowing this growth of the plate totake place in suchA a way that the clamps still holdit but compensate for its increase so that the plate will be firmly held and yet not be buckled out of shape. AThis is done by the use of sharp projections on or near the plate holding members which, on account of 4 to Wood .Newspaper Machinery.Corlporatiom l Newflyork, a'corprat'ionl'ofvrginia "platefas the'plat'e ig'rows towar'dthem.'

Yprinting plate cylinder.

Fig. s is a side view "f "a portion of the cy11n- Y into the plate.

ing causes an increase in the length and breadth i the small areas of contact `with the plate willv simply digicam 'intothf sftfmefar Referring .tofFigsijl "n d'2 it- :ll be seen'that 9J printing :Cylinder l 10 is Shown 09 which .911? mounted"endclamp's llg'center clipsf12 and acenter ring lilasusual.l A clamping screwli',` is employed tofmovejtli'e endclamps to and fro as has 'been customary." pThe platesAP4 are'heldr 'attheir zV beveled.' edges which.' rigenerate'With-*0ni1?lr mentary b'evels fonthe 'several holding, mearrs',K`

ooi

namely the .end clamps, centerclipsandcenter. l

ring. In thefformillustratedinthese'guresfthe` plateis positioned at itsistrai'g'ht"edgesloy the usual solidpmargin bar'16.' "Thisjmargingbar'is .flat and, radial omis leasing' edge Where igen.- gages the rear edge of Lthefplate and constitutes positive Ameans for'"causingV the plate` to {mo've around with Vthe cylir 1der .-*V Onits" following or reared'ge it` does not` touch the following Yplate ,usually-1 i Y, ff..

Holding members ,16? are vlinxe'd `to the cylinder preferablyfnear the -ends `of the `margirifwbarf.

Thesefblock's areprovi'ded-with edges Vl'that stick L" into therfijont'edges ofthe'following plate `"on K scf its radial .endsurface'.` fThe plate is placedfin the properplace to ,begin with and'heldv bythe sevf'- y eral holding meinb'ers narrlied.` As it increases in embedded, inl'the relatiyelyjsoit metal of the plate.` Thus the plateiisrmly held at all ytimes and its the metal. This sharp edge 17 ,as'indi`cated in` Fig. 3- is a long radial edge which, ofcourse, cuts growth in length iscompensated for by the factk j i f l that these sharp edges or points sink `further intovr placed by one 19 having aV sharp point and also a beveled edge. These last two forms out into the plate as the plate lengthens withlessresistvthe form shown in.v Fig. `6 inl wittlichv there is av tangential side to the pinl 19 adjacent to the 'cylv ance than'inthecaseshown in.Fig. A3 and yet they holdthe Vplate in position, particularly in inder and, no matter how much it cuts in; this straight cylindrical surfacev holds the' plate Vin Vplace firmly against ythe cylinden `This pin is so` constructed thatra .point bearsagainst thefplatev and thus provides a positioning means with'av minimum/of resistance 'tothe lengthening vof thek "7 plate and with a beveled `edge which'will cut i tV self into the plate,f`without damage if the pressman puts the plate'on improperly `so that it cov-V ers the plate sppOrt'readiIy. Afdouble'slant, 1.1.0.7"

c with a Wedge shaped edge canrbe usedin this Way.

Other means for positioning the plate properlyto prevent any damage from creepage consists of sharp projections 20, 21 'or 22 in the end clamp,

center `clips and center ring or other holding members These@ edthemselvesin the plete When vit is lockduw thus'pfevent' afiylngglar movement' ofthe plate. Eali pin' isieq'ui'ppe'd with a sharp. projecting edge or point adapted to embed itself in the beveled edge of the soft plat These latter ones particularly prevent creep1 of the plate.V Y Y In the form shown in Fig. v10 a all the- Way through one "Qi `t use and has apoint on eafeV ,v l l the bevels of the plates on thev pp'o'si'teisidel Also in the' form shoWifi'Fig; Y123:12 Shar-DT edged pin 24 is inserted into any one o'lfmthec ipsM now in use and holds the plate in a Way'sir'i ai"Y .tofthatiQf-Fig'g, Off; @QW-Ss? 951 other sidi@ 95m31.9-

ns nt when@ .I here illus c, al xnbedinients Ooi.' the. as applied t ein:

holding the edge of a printing plate on afprint-V ing cylinder, said member having an elongated vladL sharp surface arranged radially for engaging the edge of the plate and capable of penetrating fur-V ther inif the edge of the plate moves toward it.V

m'ou'ted on" apnntingcylinder; saint-#member Y having a sharp projection for engaging the edge l of kthe plate throughout the Width of said edge, for

the purpose described.

g 3 .Mfljhejcombination withv a margin bar for a printi g late cylinder, o f holding members ad- Vie1 projections thereon'or the n u heorWard edge of a print- 'ing plateandhol n'g the plate in position andv allsonllovving"for'.the1 ,1engthening of the plate cirurnferentially onfthe cylinder. c'

ll-"Th'e' combination Withl a margin bar for a printingy plate', cylinder, of a plurality of; projecno v viqeqjwitngsn gesjaii draai-alf respect t "tle cyli'dlerff theses. .es 1p1apef-wfeefeby, if the plate? t of positiorior'lengthens dur'A pressionslthissharpxara w "Wo k.

rio Y prin-jos 

